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Friday, January 17, 2014

5K Push Pull Output Transformer



5K push-pull output transformer

We’ve received an order from Mr.’tubeworld’ (alias in diyaudio.com) from Singapore and he’s about to pick up his Precision Series 5K push-pull output transformer when he drops by for holidays. He used our Vintage Series output transformer and was very delighted, now he wanted more.

According to our email and phone conversation, looks like Mr.’tubeworld’ has quite extensive experience on DIY tube amplifier and he’s looking for an alternative to the famous L-brand transformers. Since Singapore is just across the straits, he’s wondering if there are quality vendors in his neighboring country. He was recommended by another local DIYer to look for us for customized transformers. 

Apart from power transformers, PSU chokes and plate chokes, a pair of HIGH QUALITY 5K push-pull output transformers was ordered. 

His current L-brand output transformer is excellent in quality, but he feels that the mids are not as warm and thick as he wished. He has heard about our Vintage Series but he wanted more and wanted only the best. We have to properly design and implement this, especially considering that he has a lot of famous output transformers at his disposal to compare with ours, LOL! There goes nothing! 

Without further ado, the 5K push-pull output transformers were completed (on expedite mode) and our guru did some measurement, and we were really quite delighted with the all hard work put-in to make this possible. Here goes the results, tested with HP4192A:

Frequency             Impedance           +/-dB          Phase
        5Hz                  3850                     -1.13
      10Hz                  4310                     -0.64
      20Hz                  4585                     -0.38      14.4 deg.
      30Hz                  4661                     -0.30      12.0 deg.
      50Hz                  4775                     -0.20
    100Hz                  4790                     -0.20      7.5 deg.
    500Hz                  4990                     -0.01
  1000Hz (ref)           5001                     -0.00      1.1 deg.
  2000Hz                   4997                     -0.00
  5000Hz                   4960                     -0.03
10000Hz                   4890                     -0.09      9.3 deg.
15000Hz                   4888                     -0.01
20000Hz                   4799                     -0.18      18.4 deg.
25000Hz                   4685                     -0.28
30000Hz                   4550                     -0.41      27.1 deg.
35000Hz                   4150                     -0.81
40000Hz                   4250                     -0.71
45000Hz                   4092                     -0.87
50000Hz                   3910                     -1.07

We keep up with our standard/promise: 5Hz – 50kHz +/- 1.2dB (we better it infact!) 

Based on such test data, it should be a very well balanced, linear output transformer. The other components on the amplifier will be the limiting factor instead of the output transformer. Mr.”tubeworld” should be very satisfied with this pair of 5K push-pull output transformer.

Thanks for watching! Hope to hear the feedback from Mr.”tubeworld” after he uses and compare this with the other famous manufacturers! 

J&K Audio Design
18/Jan/2014

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Iso-trans: link 1, link 2

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* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.

* Our product lines are always improving and increasing. If you do not see what you want, contact us!

* Please email for volume discounts, distributor and OEM pricing.

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